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ARCS® WIDE SYSTEM
ARCS® FOCUS SYSTEM
user manual
VERSION 1.2
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ARCS® WIDE TypeProduit
user manual
VERSION 1.2
SAFETY INSTRUCTIONS
1.
Read this manual
2.
Follow all SAFETY INSTRUCTIONS as well as DANGER and OBLIGATION warnings
3.
Never incorporate equipment or accessories not approved by L-ACOUSTICS®
4.
Read all the related PRODUCT INFORMATION documents before exploiting the system
The product information document is included in the shipping carton of the related system component.
5.
Read the RIGGING MANUAL before installing the system
Use the rigging accessories described in the rigging manual and follow the associated procedures
6.
Beware of sound levels
Do not stay within close proximity of loudspeakers in operation and consider wearing earplugs.
Loudspeaker systems are capable of producing very high sound pressure levels (SPL) which can instantaneously
lead to permanent hearing damage to performers, production crew and audience members. Hearing damage can
also occur with prolonged exposure to sound: 8 h at 90 dB(A), 30 min at 110 dB(A), less than 4 min at 130 dB(A).
SYMBOLS
The following symbols are used in this document:
DANGER
This symbol indicates a potential risk of harm to an individual or damage to the product.
It can also notify the user about instructions that must be strictly followed to ensure safe installation or operation
of the product.
OBLIGATION
This symbol notifies the user about instructions that must be strictly followed to ensure proper installation or
operation of the product.
INFORMATION
This symbol notifies the user about complementary information or optional instructions.
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CONTENTS
ARCS® WIDE / FOCUS SYSTEM
4
1
SYSTEM COMPONENTS
5
1.1
Loudspeaker enclosure ............................................................................................................................................................... 5
1.2
Powering and driving system ....................................................................................................................................................... 5
1.3
Loudspeaker cables ..................................................................................................................................................................... 5
1.4
Rigging element ........................................................................................................................................................................... 5
1.5
Software application .................................................................................................................................................................... 5
2
LOUDSPEAKER CONFIGURATIONS
2.1
Line source .................................................................................................................................................................................. 7
7
Standalone ARCS WIDE/FOCUS line source ............................................................................................................................. 7
2.2
Line source with low-frequency element .................................................................................................................................... 8
ARCS WIDE/FOCUS line source + SB18m ............................................................................................................................... 8
2.3
Line source element .................................................................................................................................................................... 9
Single ARCS WIDE/FOCUS enclosure ....................................................................................................................................... 9
2.4
Line source with low-frequency element .................................................................................................................................. 10
Single ARCS WIDE/FOCUS + SB18m ..................................................................................................................................... 10
3
LOUDSPEAKER CONNECTION
11
3.1
Connectors ............................................................................................................................................................................... 11
3.2
Connection to LA4 / LA4X ....................................................................................................................................................... 12
Option A................................................................................................................................................................................... 12
Option B ................................................................................................................................................................................... 14
3.3
Connection to LA8 .................................................................................................................................................................... 15
Option A................................................................................................................................................................................... 15
Option B ................................................................................................................................................................................... 17
APPENDIX A
PRESET DESCRIPTION
19
[ARCS_WIFO] and [ARCS_WIFO_FI] ...................................................................................................................................... 19
[SB18_60] ................................................................................................................................................................................. 19
[SB18_60_C] ............................................................................................................................................................................ 19
APPENDIX B
APPENDIX C
RECOMMANDATION FOR SPEAKER CABLES
SPECIFICATIONS
19
20
ARCS FOCUS........................................................................................................................................................................... 20
ARCS WIDE ............................................................................................................................................................................. 21
SB18m ...................................................................................................................................................................................... 22
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ARCS® WIDE SYSTEM
ARCS® FOCUS SYSTEM
user manual
VERSION 1.2
ARCS® WIDE / FOCUS SYSTEM
The ARCS® WIDE and ARCS® FOCUS systems are based on two constant curvature enclosures ensuring distinct
directivity pattern and SPL capabilities. Intended for medium-throw applications in rental productions and fixed
installations, these line sources deliver remarkable acoustic properties and unmatched versatility for applications
including FOH L/R systems, central clusters, side-fill monitors, distributed systems and complementary fills.
The main systems components consist of the following:
•
•
•
•
ARCS® WIDE (H x V: 30° x 90°) element, wide coverage, operating from 55 Hz to 20 kHz;
ARCS® FOCUS (H x V: 15° x 90°) element, focused energy, operating from 55 Hz to 20 kHz;
SB18m low frequency extension, operating down to 32 Hz;
LA4, LA4X or LA8 amplified controllers.
The ARCS® WIDE or ARCS® FOCUS line sources provide high SPL with perfect acoustic coupling, a solid LF
performance and constant tonal balance over distance. Both systems can be deployed either as a horizontal array or as
a vertical array.
In the coupling plane, the ARCS® WIDE and ARCS® FOCUS yield a razor-sharp directivity pattern, particularly valuable
to sector audience fields while avoiding reflective surfaces. In the other plane, both systems provide a 90° smooth
symmetric directivity pattern.
The ARCS® WIDE is suited to achieve an extensive coverage with few elements, offering a remarkably compact array
preserving sightlines. The total coverage angle of an ARCS® WIDE line source is proportional to the number N of
enclosures in the array, i.e. N x 30°.
The ARCS® FOCUS line source focuses the same acoustic energy within half of the coverage angle, i.e. N x 15°. The
ARCS® FOCUS is therefore suited to achieve a narrower coverage, offering a higher SPL with a more extended throw
than its sibling.
The ARCS® WIDE and ARCS® FOCUS can also be deployed in “WIFO” hybrid arrays for complex audience
geometries. The dual directivity pattern and the various system configurations offered to the sound designer and
system engineer allow a high level of creative freedom. Before installation, all these configurations can be acoustically
and mechanically modeled with the SOUNDVISION 3D simulation software.
The amplified controllers offer an advanced and precise drive system for the ARCS ® WIDE and ARCS® FOCUS
enclosures. Both can be driven with the same preset. All L-ACOUSTICS amplified controllers feature the L-DRIVE, a
thermal and over-excursion protection circuit.
Up to 253 LA8 amplified controllers can be connected together via the Ethernet-based L-NET protocol. The LA
NETWORK MANAGER software allows online remote control and monitoring of all the connected units, via a userfriendly and intuitive graphic interface, and features the Array Morphing EQ. This exclusive tool allows the engineer to
quickly adjust the tonal balance of the system to reach a reference curve or to ensure consistency of the sonic
signature.
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1 SYSTEM COMPONENTS
The system approach developed by L-ACOUSTICS® consists in offering a global solution that guarantees the highest
and most predictable level of performance at any step of loudspeaker system deployment: modeling, installation, and
operation. A complete L-ACOUSTICS® system includes enclosures, amplified controllers, cables, rigging system and
software applications.
1.1
Loudspeaker enclosure
ARCS® WIDE
Full-range (55Hz – 20kHz), 2-way passive, constant curvature WST® line source, 90° x 30°
ARCS® FOCUS
Full-range (55Hz – 20kHz), 2-way passive, constant curvature WST® line source, 90° x 15°
SB18m
High power subwoofer (down to 32Hz)
Loudspeaker system design
Sound design aspects are beyond the scope of this document. However, the various applications of the system
will be based on the loudspeaker configurations presented in this document.
1.2
Powering and driving system
LA4, LA4X or LA8
Amplified controllers with DSP, preset library and networking capabilities
Operating instructions
Refer to the LA4, LA4X, LA8 or LA-RAK user manuals.
1.3
Loudspeaker cables
DO cables (DO.7, DO10, DO25)
8-point PA-COM® loudspeaker cables (4 mm² section).
Respective lengths of 0.7 m/2.3 ft, 10 m/32.8 ft, and 25 m/82 ft.
DOSUB-LA8
Breakout cable for four passive enclosures.
8-point PA-COM® to 4 × 2-point SpeakON® (4 mm² section).
SP cables (SP.7, SP5, SP10, SP25)
4-point SpeakON® loudspeaker cables (4 mm² section).
Respective lengths of 0.7 m/2.3 ft, 5 m/16.4 ft, 10 m/32.8 ft and 25 m/82 ft.
SP-Y1
Breakout cable for two passive enclosures.
4-point SpeakON® to 2 × 2-point SpeakON® (2.5 mm² section).
Provided with CC4FP adapter.
Information about the connection of the enclosures to the LA amplifiers is given in this document.
Refer to the LA4, LA4X, LA8 or LA-RAK user manuals for detailed instructions about the whole cabling
scheme, including modulation cables and network.
1.4
Rigging element
Rigging elements or procedures are not presented in this document.
Refer to the ARCS® WIDE/FOCUS rigging manual.
1.5
Software application
SOUNDVISION
Proprietary acoustical and mechanical 3D modeling software.
LA NETWORK MANAGER
Remote control and monitoring of amplified controllers
Using L-ACOUSTICS® software
Refer to the SOUNDVISION user manual and the LA NETWORK MANAGER tutorial.
ARCSWIFO_UM_EN_1.2
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ARCS® WIDE SYSTEM
ARCS® FOCUS SYSTEM
user manual
VERSION 1.2
ARCS® FOCUS
SB18m
LA4X
SPY1
SP7
LA4
SP5
ARCS® WIDE
LA8
SP10
DO10
DO3WFILL
SP25
DOSUB-LA8
DO25
DO.7
LA Network Manager
Soundvision
ARCS® WIDE/FOCUS system components (excluding rigging elements and modulation cables)
ARCSWIFO_UM_EN_1.2
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2 LOUDSPEAKER CONFIGURATIONS
2.1
Line source
Deployed as a standalone line source, an ARCS WIDE/FOCUS system operates over the nominal bandwidth of the
ARCS WIDE/FOCUS enclosure.
The [ARCS_WIFO] preset allows for a reference frequency response in medium throw applications.
This configuration is driven by the LA4, LA4X or LA8 amplified controller.
Standalone ARCS WIDE/FOCUS line source
Horizontal
Vertical
Frequency range (-10 dB)
55 Hz – 20 kHz
ARCSWIFO_UM_EN_1.2
Enclosure
®
ARCS WIDE / FOCUS
www.l-acoustics.com
[PRESET]
 [ARCS_WIFO]
7
ARCS® WIDE SYSTEM
ARCS® FOCUS SYSTEM
user manual
VERSION 1.2
2.2
Line source with low-frequency element
In this configuration – an ARCS® WIDE/FOCUS line source deployed with SB18m subwoofers – the system bandwidth
is extended in the low end.
The [ARCS_WIFO] preset allows for a reference frequency response in medium throw applications.
The [SB18_60] preset provides the subwoofer enclosures with an upper frequency limit at 60 Hz for an optimal
frequency coupling with the ARCS® WIDE/FOCUS line source.
This configuration is driven by the LA4, LA4X or LA8 amplified controllers.
ARCS WIDE/FOCUS line source + SB18m
Flown
Stacked
Flown horizontal ARCS WIDE/FOCUS with
ground-stacked SB18m
Enclosure
ARCS WIDE/FOCUS
SB18m
®
Frequency range (-10dB)
32 Hz – 20 kHz
ARCSWIFO_UM_EN_1.2
Mixed arrays
[PRESET]
 [ARCS_WIFO]
 [SB18_60]
Recommended ratio
1 ARCS® WIDE / FOCUS: 1 SB18m
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2.3
Line source element
In this configuration – a single ARCS® WIDE/FOCUS enclosure without complementary subwoofers – the system
operates over the nominal bandwidth of the enclosure.
The [ARCS_WIFO_FI] preset allows for a reference frequency response in short throw applications.
This configuration is driven by the LA4, LA4X or LA8 amplified controller.
Single ARCS WIDE/FOCUS enclosure
Frequency range (-10 dB)
55 Hz – 20 kHz
ARCSWIFO_UM_EN_1.2
Enclosure
®
1 ARCS WIDE / FOCUS: 1 SB18m
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[PRESET]
 [ARCS_WIFO_FI]
9
ARCS® WIDE SYSTEM
ARCS® FOCUS SYSTEM
user manual
VERSION 1.2
2.4
Line source with low-frequency element
In this configuration – a single ARCS® WIDE/FOCUS enclosure deployed with an SB18m subwoofer – the system
bandwidth is extended in the low end.
The [ARCS_WIFO_FI] preset allows for a reference frequency response in short throw applications.
The [SB18_60] preset provides the subwoofer enclosures with an upper frequency limit at 60 Hz for an optimal
frequency coupling with the ARCS® WIDE/FOCUS element.
This configuration is driven by the LA4, LA4X or LA8 amplified controllers.
Single ARCS WIDE/FOCUS + SB18m
Enclosure
ARCS® WIDE/FOCUS
SB18m
[PRESET]
 [ARCS_WIFO_FI]
 [SB18_60]
Frequency range (-10dB)
Recommended ratio
32 Hz – 20 kHz
1 ARCS® WIDE / FOCUS: 1 SB18m
ARCSWIFO_UM_EN_1.2
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3 LOUDSPEAKER CONNECTION
3.1
Connectors
Internal pinout for L-ACOUSTICS® ARCS WIDE/FOCUS and SB18m
SpeakON® points
1+
1-
2+
2-
Transducer connectors
+
-
Not used
Not used
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ARCS® WIDE SYSTEM
ARCS® FOCUS SYSTEM
user manual
VERSION 1.2
3.2
Connection to LA4 / LA4X
Maximum number of enclosures per LA4 / LA4X
®
One ARCS WIDE/FOCUS or one SB18m can be connected to each output channel on the LA4 / LA4X.
Therefore, a single LA4 / LA4X amplified controller can drive up to:
®
 4  ARCS WIDE/FOCUS or
 4  SB18m or
®
 3  ARCS WIDE/FOCUS and 1  SB18m.
Cardioid configuration
Connect the reversed subwoofer(s) to OUT 1 to use the cardioid preset.
Impedance load
8 Ω for 1 enclosure.
Option A
 Use SP cables (SP.7, SP5, SP10 or SP25) to connect first enclosures to the four LA4 / LA4X output channels.
LA4 / LA4X option A maximum configuration with ARCS® WIDE/FOCUS
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LA4 / LA4X option A maximum configuration with ARCS® WIDE/FOCUS + SB18m
LA4 / LA4X option A maximum configuration with SB18m
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ARCS® WIDE SYSTEM
ARCS® FOCUS SYSTEM
user manual
VERSION 1.2
Option B
 Connect an SP cable (SP.7, SP5, SP10 or SP25) to the OUT1/OUT2 and OUT3/OUT4 connectors of the LA4 /
LA4X.
 Use a CC4FP adapter to connect an SP-Y1 cable and separate the two output channels.
LA4 / LA4X option B maximum configuration with ARCS® WIDE/FOCUS
LA4 / LA4X option B maximum configuration with ARCS® WIDE/FOCUS + SB18m
LA4 / LA4X option B maximum configuration with SB18m
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3.3
Connection to LA8
Maximum number of enclosures per LA8
Two ARCS WIDE/FOCUS or two SB18m can be connected in parallel to each output channel on the LA8.
Therefore, a single LA8 amplified controller can drive up to:
 8  ARCS® WIDE/FOCUS or
 8  SB18m or
 4  ARCS® WIDE/FOCUS and 4  SB18m.
Cardioid configuration
Connect the reversed subwoofer(s) to OUT 1 to use the cardioid preset.
Impedance load
8 Ω for 1 enclosure, 4 Ω for 2 enclosures.
Option A
 Connect a DO cable (DO.7, DO10 or DO25) to the LA8 PA-COM® connector
 Use the DOSUB-LA8 to separate the four output channels.
 If necessary, use SP cables to connect additional similar enclosures in parallel with the first ones.
LA8 option A maximum configuration with ARCS® WIDE/FOCUS
Corresponding DOSUB-LA8 SpeakON® points and LA8 output channels:
SPK1 = OUT 1
SPK2 = OUT 2
ARCSWIFO_UM_EN_1.2
SPK3 = OUT 3
SPK4 = OUT 4
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ARCS® WIDE SYSTEM
ARCS® FOCUS SYSTEM
user manual
VERSION 1.2
LA8 option A with ARCS® WIDE/FOCUS + SB18m
LA8 option A with SB18m
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Option B
 Connect an SP cable (SP.7, SP5, SP10 or SP25) to the OUT1/OUT2 and OUT3/OUT4 LA8 SpeakON® connectors.
 Use a CC4FP adapter to connect an SP-YI cable and separate the two output channels.
 If necessary, use SP cables to connect additional similar enclosures in parallel with the first ones.
LA8 option B maximum configuration with ARCS® WIDE/FOCUS
LA8 option B with ARCS® WIDE/FOCUS + SB18m
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ARCS® WIDE SYSTEM
ARCS® FOCUS SYSTEM
user manual
VERSION 1.2
LA8 option A maximum configuration with SB18m
ARCSWIFO_UM_EN_1.2
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APPENDIX A
PRESET DESCRIPTION
[ARCS_WIFO] and [ARCS_WIFO_FI]
The [ARCS_WIFO] preset allows for a reference frequency response in medium throw applications.
The [ARCS_WIFO_FI] preset allows for a reference frequency response in short throw applications.
Default parameters
Gain
Delay
Polarity
0 dB
0 ms
+
Mute
ON
IN A
IN B
0 dB
0 dB
0 ms
0 ms
+
+
ON
ON
IN B
0 dB
0 ms
+
ON
Loudspeaker elements
Amplifier outputs
Channels
ARCS WIDE/FOCUS
OUT 1
PA
Routing
IN A
ARCS WIDE/FOCUS
ARCS WIDE/FOCUS
OUT 2
OUT 3
PA
PA
ARCS WIDE/FOCUS
OUT 4
PA
[SB18_60]
The [SB18_60] preset provides the subwoofer enclosures with an upper frequency limit at 60 Hz.
Default parameters
Gain
Delay
Polarity
0 dB
0 ms
+
Mute
ON
IN A
IN B
0 dB
0 dB
0 ms
0 ms
+
+
ON
ON
IN B
0 dB
0 ms
+
ON
Loudspeaker elements
Amplifier outputs
Channels
SB18
OUT 1
SB
Routing
IN A
SB18
SB18
OUT 2
OUT 3
SB
SB
SB18
OUT 4
SB
[SB18_60_C]
The [SB18_60_C] preset provides the subwoofer enclosures with an upper frequency limit at 60 Hz.
It features optimized delay settings for SB18 arrays in cardioid configuration.
Loudspeaker elements
Amplifier outputs
Channels
Reversed SB18
SB18
OUT 1
OUT 2
SR
SB
SB18
SB18
OUT 3
OUT 4
SB
SB
Routing
IN A
Default parameters
Gain
Delay
Polarity
0 dB
0 ms
+
Mute
ON
ON
ON
ON
APPENDIX B RECOMMANDATION FOR SPEAKER CABLES
Cable quality and resistance
Only use high-quality fully insulated speaker cables made of stranded copper wire.
Use cables of gauge offering low resistance per unit length and keep the cables as short as possible.
The following table provides the recommended maximum length depending on the cable cross-section and on the
impedance load connected to the amplifier.
Recommended maximum length
Cable cross-section
8 Ω load
2.7 Ω load
4 Ω load
mm2
SWG
AWG
m
ft
m
ft
m
ft
2.5
15
13
30
100
15
50
10
33
4
13
11
50
160
25
80
17
53
6
11
9
74
240
37
120
25
80
10
9
7
120
390
60
195
40
130
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ARCS® WIDE SYSTEM
ARCS® FOCUS SYSTEM
user manual
VERSION 1.2
APPENDIX C
SPECIFICATIONS
ARCS FOCUS
Description
2-way passive enclosure, amplified by LA4X or LA8
Usable bandwidth (-10 dB)
Maximum SPL
1
55 Hz - 20 kHz ([ARCS_WIFO] preset)
137 dB ([ARCS_WIFO] preset)
Coverage angle (-6 dB)
15°  90°
LF : 1  12" weather-resistant, bass-reflex.
Transducers
HF: 1  3" , diaphragm compression driver, DOSC® waveguide.
Nominal impedance
8Ω
RMS power handling
450 W
Connectors
IN: 1  4-point SpeakOn®
LINK: 4-point SpeakOn®
Rigging components
Rigging rails and WIFORIG rigging bars.
Dimensions
Weight (net):
38 kg / 84 lb
Cabinet:
Baltic birch plywood.
Finish:
Front:
Dark Grey brown (Pantone 426C)
Pure white (RAL 9010®)
Custom RAL code on special order
Steel grill with anti-corrosion coating, Airnet® fabric
Protection Rating:
IP45
Rigging components:
High strength steel with anti-corrosion coating
Physical data
1 Peak level at 1 m under free field conditions, using 10 dB crest factor pink noise with specified preset.
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ARCS WIDE
Description
2-way passive enclosure, amplified by LA4X or LA8
Usable bandwidth (-10 dB)
Maximum SPL
1
55 Hz - 20 kHz ([ARCS_WIFO] preset)
135 dB ([ARCS_WIFO] preset)
Coverage angle (-6 dB)
30°  90°
LF 1  3" diaphragm compression driver, DOSC® waveguide.
Transducers
HF 1  2", weather-resistant, bass-reflex.
Nominal impedance
8Ω
RMS power handling
450 W
Connectors
IN: 1  4-point SpeakOn®
LINK: 4-point SpeakOn®
Rigging components
Rigging rails and WIFORIG rigging bars.
Dimensions
Weight (net):
36 kg / 79 lb
Cabinet:
Baltic birch plywood.
Finish:
Front:
Dark Grey brown (Pantone 426C)
Pure white (RAL 9010®)
Custom RAL code on special order
Steel grill with anti-corrosion coating, Airnet® fabric
Protection Rating:
IP45
Rigging components:
High strength steel with anti-corrosion coating
Physical data
1 Peak level at 1 m under free field conditions, using 10 dB crest factor pink noise with specified preset.
ARCSWIFO_UM_EN_1.2
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ARCS® WIDE SYSTEM
ARCS® FOCUS SYSTEM
user manual
VERSION 1.2
SB18m
Description
Subwoofer enclosure, amplified by LA4X or LA8
Low frequency limit (‑10 dB)
Maximum SPL
1
32 Hz ([SB18_100] preset)
136 dB ([SB18_100] preset)
RMS power handling
700 W
Transducers
1  18" weather-resistant, bass-reflex
Nominal impedance
8Ω
Connectors
IN: 1  4-point SpeakON®
Rigging components
Integrated pole-mount socket
Captive coupling bars
Handles integrated into the cabinet
LINK: 1  4-point SpeakON®
Dimensions
Weight (net):
62 kg / 137 lb
Cabinet:
Baltic birch plywood
Finish:
Dark Grey brown (Pantone 426C)
Pure white (RAL 9010®)
Custom RAL code on special order
Front:
Steel grill with anti-corrosion coating
Airnet® acoustically neutral fabric
Steel with anti-corrosion coating
Physical data
Rigging
components:
1
Peak level at 1 m under half-space conditions, using 10 dB crest factor pink noise with specified preset.
ARCSWIFO_UM_EN_1.2
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ARCSWIFO_UM_EN_1.2
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Document reference: ARCSWIFO_UM_EN_1.2
Distribution date: March 31, 2014
© 2014 L-ACOUSTICS®. All rights reserved.
No part of this publication may be reproduced or transmitted in any form
or by any means without the express written consent of the publisher.
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